ZHEEV search not supported with older autoconf

[kostrzewa]

When building on jugene or any machine with a slightly older autoconf the AC_SEARCH_LIBS for zheev will fail. I don't know whether this can be fixed but if it can't, we should work around it by detecting the AC version and disabling this macro altogether. The build works regardless if you have the right flags set for --with-lapack . (but of course, having it working is a good test for the right flags! )

[urbach]

is this still an issue?

[kostrzewa]

Yes, this is still an issue and will always remain broken for older autoconf versions. In practice I just disable the check when I compile in Zeuthen (surprise! :D ) but it is quite annoying.